The average weight of 6 persons is 65 kg. If a person weighing 80 kg joins, what is the new average? MCQ with Answer and Explanation

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The average weight of 6 persons is 65 kg. If a person weighing 80 kg joins, what is the new average?

A. 67.14 kg

B. 66.67 kg

C. 67.5 kg

D. 68 kg

Answer: Option A

Solution (By JKSSB Mock Tests)

Sum=6×65=390. New sum=390+80=470. New avg=470/7=67.14.

This question belongs to: Maths Average

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Question #1

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The average of 8 numbers is 50. If one number 70 is replaced by 54, what is the new average?

A. 48

B. 49

C. 52

D. 50

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Correct Answer: Option A

Explanation:
Original total = 8×50 = 400. New total = 400−70+54 = 384. New average = 384/8 = 48.

This question belongs to: Maths Average

Question #2

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If average of 20 numbers is 30 and 10 numbers average 25, average of remaining 10?

A. 35

B. 40

C. 30

D. 32.5

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Correct Answer: Option A

Explanation:
Sum20=600. Sum10=250. Remaining=350. Average=35.

This question belongs to: Maths Average

Question #3

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Average of 165,220,275 is

A. 215

B. 220

C. 230

D. 210

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Correct Answer: Option B

Explanation:
660/3=220.

This question belongs to: Maths Average

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